Abstract: The invention discloses a secure payment method, a mobile device and a secure payment system. The secure payment method including steps of: transmitting an encrypted payment request packet from a payment service provider to a mobile device; receiving the encrypted payment request packet by a first operating system running within a normal domain of the mobile device; bypassing the encrypted payment request packet to a second operating system running within a secured domain on the mobile device; decrypting payment request data from the encrypted payment request packet under the secured domain; generating payment response data according to the payment request data under the secured domain; encrypting the payment response data into an encrypted payment response packet under the secured domain; bypassing the encrypted payment response packet to the first operating system under the normal domain; and, transmitting the encrypted payment response packet to the payment service provider.

Abstract: An electronic load simulates an LED is to output a simulation signal after receiving an input signal. The simulation signal has a voltage value and a current value approximating to a characteristic curve of a real LED. The electronic load comprises a processor, an amplifier, and a control unit. The processor receives a control command to set up the LED. The control command includes a forward voltage parameter and an equivalent impedance parameter. The control unit generates an adjustment command according to the foregoing parameters and the voltage of the power source. The amplifier receives and further adjusts the adjustment command so as to output the simulation signal.